Abstract
Fast-growing poplar plantations on agricultural land require intensive management activities, often involving fertilization. The present paper aims at investigating the effect of fertilization on growth and on groundwater quality, by examining four trials established in commercial poplar plantations in central and south Sweden. The treatments consisted of nitrogen applications (Urea N46, Tot. N: 46%) in two different dosages, 75 and 150 kg ha−1 for two years, and a control, in three replicates (plot size: 20 × 20 m) following a randomized block design. Diameters were measured at each plot at the end of each growing season for the period 2012–2015. At the same time, groundwater pipes were installed in the center of each plot, at ca. 1.5 m depth. Samples were regularly collected and analyzed for NO3-N and PO4-P. The results show a large variation in the diameter growth response to nitrogen fertilization and the leaching of poplar plantations after canopy closure. In young plantations, the effect on growth was clear with moderate fertilization rates although it was not observed on sandy soils with already good growth, leading to high nitrogen leaching.
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Claims 5
Claim · model-written summary
Diameter growth response to nitrogen fertilization varied substantially after canopy closure.
PopulusNot reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The results show a large variation in the diameter growth response to nitrogen fertilization and the leaching of poplar plantations after canopy closure.”
Claim · model-written summary
Leaching from fertilized poplar plantations varied after canopy closure.
- Treatment
- nitrogen fertilizatione0
- Outcome
- leaching of poplar plantationse0
- Qualifier
- after canopy closuree0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The results show a large variation in the diameter growth response to nitrogen fertilization and the leaching of poplar plantations after canopy closure.”
Claim · model-written summary
Moderate fertilization clearly increased growth in young plantations.
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In young plantations, the effect on growth was clear with moderate fertilization rates although it was not observed on sandy soils with already good growth, leading to high nitrogen leaching.”
t0“poplar”
Claim · model-written summary
Growth response to moderate fertilization was not observed on sandy soils with good growth.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“it was not observed on sandy soils with already good growth”
e1“moderate fertilization rates”
t0“poplar”
Claim · model-written summary
Sandy soils with already good growth showed high nitrogen leaching after fertilization.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“sandy soils with already good growth, leading to high nitrogen leaching.”
t0“poplar”
The same questions in other papers
fertilization · growth · Populus (poplar)Results differ
35 papers in the same direction as this paper · 9 in the opposite direction · 1 reporting no difference from an alternative
- negative
- positive
- no effect
42 papers more in this group
See all 46 papers →Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.